I have used their .25, .28, .32 and .36 Frag rounds. They say they are not double polished but they sure do look and feel like they are.
So far have run them through the following barrels 6.01 G&P, 6.03 G&P, 6.01 TK Twist, 6.03 TM, 6.01 Madbull with no issues.
Only shot a few hundred rounds of the .28, .32 and .36 ones, but I've gone through approximately 6000 of the .25's.
Saskatchewan Age Verifier! Contact for more Info.
http://airsoftcanada.com/showthread.php?t=174161 - Honour & Respect your fellow players! #Airsofthonourandrespect